Each time I try to make a union of more than just a couple of parts, Studio crashes.
I feel this may be due to the system, internet or other circumstances your end.
If not then it could be CSG screwing up, you can look up CSG issues on roblox wikis and they will tell you a lot of things to help fix, or dampen this issue.
Hope i helped - Irish ( i would enjoy you to accept this as an answer :) ) Thanks!
Closed as off-topic by Sonnenroboter and hiimgoodpack
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